Marvel United
Are special effects and their actions on hero cards mandatory?
Several players reading the card text agree, and the rulebook says "may" for actions.
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- Marvel United rulebook · Rulebook · 3. Resolve Actions
Usually not. Special effects and action icons are optional. The exception is rare cards with inverted white-on-black text, whose abilities are mandatory. A mandatory effect must still resolve on your own turn, but you choose when in that turn.